12420123553 has 4 divisors (see below), whose sum is σ = 12468451140. Its totient is φ = 12371795968.

The previous prime is 12420123539. The next prime is 12420123577. The reversal of 12420123553 is 35532102421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10328250384 + 2091873169 = 101628^2 + 45737^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420123553 - 2¹³ = 12420115361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12420123503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24163408 + ... + 24163921.

It is an arithmetic number, because the mean of its divisors is an integer number (3117112785).

Almost surely, 2^12420123553 is an apocalyptic number.

It is an amenable number.

12420123553 is a deficient number, since it is larger than the sum of its proper divisors (48327587).

12420123553 is an equidigital number, since it uses as much as digits as its factorization.

12420123553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48327586.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 12420123553 its reverse (35532102421), we get a palindrome (47952225974).

The spelling of 12420123553 in words is "twelve billion, four hundred twenty million, one hundred twenty-three thousand, five hundred fifty-three".